/* Alloc.c -- Memory allocation functions
   2008-09-24
   Igor Pavlov
   Public domain */

#include "Types.h"

#include "Alloc.h"

/* #define _SZ_ALLOC_DEBUG */

/* use _SZ_ALLOC_DEBUG to debug alloc/free operations */
#ifdef _SZ_ALLOC_DEBUG
int g_allocCount = 0;
int g_allocCountMid = 0;
int g_allocCountBig = 0;
#endif

void * MyAlloc(size_t size)
{
    if (size == 0)
        return 0;
    #ifdef _SZ_ALLOC_DEBUG
    {
        void* p = malloc(size);
        fprintf(stderr, "\nAlloc %10d bytes, count = %10d,  addr = %8X", size, g_allocCount++, (unsigned)p);
        return p;
    }
    #else
    return malloc(size);
    #endif
}

void MyFree(void* address)
{
    #ifdef _SZ_ALLOC_DEBUG
    if (address != 0)
        fprintf(stderr, "\nFree; count = %10d,  addr = %8X", --g_allocCount, (unsigned)address);
    #endif
    free(address);
}

#ifdef _WIN32

void * MidAlloc(size_t size)
{
    if (size == 0)
        return 0;
    #ifdef _SZ_ALLOC_DEBUG
    fprintf(stderr, "\nAlloc_Mid %10d bytes;  count = %10d", size, g_allocCountMid++);
    #endif
    return VirtualAlloc(0, size, MEM_COMMIT, PAGE_READWRITE);
}

void MidFree(void* address)
{
    #ifdef _SZ_ALLOC_DEBUG
    if (address != 0)
        fprintf(stderr, "\nFree_Mid; count = %10d", --g_allocCountMid);
    #endif
    if (address == 0)
        return;
    VirtualFree(address, 0, MEM_RELEASE);
}

    #ifndef MEM_LARGE_PAGES
        #undef _7ZIP_LARGE_PAGES
    #endif

    #ifdef _7ZIP_LARGE_PAGES
SIZE_T g_LargePageSize = 0;
typedef SIZE_T (WINAPI * GetLargePageMinimumP)();
    #endif

void SetLargePageSize()
{
    #ifdef _7ZIP_LARGE_PAGES
    SIZE_T size = 0;
    GetLargePageMinimumP largePageMinimum = (GetLargePageMinimumP)
                                            GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "GetLargePageMinimum");
    if (largePageMinimum == 0)
        return;
    size = largePageMinimum();
    if (size == 0 || (size & (size - 1)) != 0)
        return;
    g_LargePageSize = size;
    #endif
}


void * BigAlloc(size_t size)
{
    if (size == 0)
        return 0;
    #ifdef _SZ_ALLOC_DEBUG
    fprintf(stderr, "\nAlloc_Big %10d bytes;  count = %10d", size, g_allocCountBig++);
    #endif

    #ifdef _7ZIP_LARGE_PAGES
    if (g_LargePageSize != 0 && g_LargePageSize <= (1 << 30) && size >= (1 << 18))
    {
        void* res = VirtualAlloc(0, (size + g_LargePageSize - 1) & (~(g_LargePageSize - 1)),
                                 MEM_COMMIT | MEM_LARGE_PAGES, PAGE_READWRITE);
        if (res != 0)
            return res;
    }
    #endif
    return VirtualAlloc(0, size, MEM_COMMIT, PAGE_READWRITE);
}

void BigFree(void* address)
{
    #ifdef _SZ_ALLOC_DEBUG
    if (address != 0)
        fprintf(stderr, "\nFree_Big; count = %10d", --g_allocCountBig);
    #endif

    if (address == 0)
        return;
    VirtualFree(address, 0, MEM_RELEASE);
}

#endif